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Comment 22 for Comments for the California GREET model in LCFS (ca-greet-comments-ws) - 1st Workshop.
First Name: Linda
Last Name: Swift
Email Address: dismoreswift@att.net
Affiliation: Chevron-Retired
Subject: Oil Recovery Efficiency Used is too High
Comment:
By"Oil recovery efficiency" listed in cell E-32 of the spreadsheet, I assume you mean oil recovery factor, i.e. the actual proportion of in-place oil that can be economically extracted from a reservoir. If that is indeed the case, the value you use of 98% is much too high. An average is about 20-25% (see for example http://www.ogj.com/articles/print/volume-105/issue-41/exploration-development/global-oil-reserves-1-recovery-factors-leave-vast-target-for-eor-technologies.html) Although the recovery factor can vary significantly depending on the field, it never in my experience is as high as 98%, even with exceptional EOR. A good recovery factor is more like 35-45%. Secondary and tertiary recovery might add another 10% each. There is a huge amount of data on this to get a robust average number.
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Date and Time Comment Was Submitted: 2014-12-04 10:57:14
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